"Bernie Sanders has taken a stand, and Bernie Sanders has been taking a stand for a very long time. He has been consistent, he has been convicted, he has been committed. And now it's time, I'm here and you're here, because it's time for us to take a stand with Bernie," Williamson told the crowd in Austin.
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"We're being told oh, it can't happen. He can't beat (President Donald) Trump. Bernie can't beat Trump, it can't happen," Williamson said. "I'll tell you what's already happened to those who say it cannot happen. You just tell them this. It already happened. He won Iowa. It already happened, he won New Hampshire. It already happened, he won Nevada," Williamson added, pointing to Sanders' growing momentum.